Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Apr. 19, 2024	Jun. 30, 2023
Document Type	10-K/A
Amendment Flag	true
Amendment Description	Amendment No. 2
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Current Fiscal Year End Date	--12-31
Entity File Number	001-39248
Entity Registrant Name	The Oncology Institute, Inc.
Entity Central Index Key	0001799191
Entity Tax Identification Number	84-3562323
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	18000 Studebaker Rd
Entity Address, Address Line Two	Suite 800
Entity Address, City or Town	Cerritos
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90703
City Area Code	562
Local Phone Number	735-3226
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	false
Entity Shell Company	false
Entity Public Float			$ 41.6
Entity Common Stock, Shares Outstanding		74,313,404
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Auditor Firm ID	243
Auditor Name	BDO USA, P.C.
Auditor Location	Costa Mesa, California
Common Stock [Member]
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	TOI
Security Exchange Name	NASDAQ
Redeemable Warrants [Member]
Title of 12(b) Security	Redeemable warrants, each whole warrant exercisable for one share of Common stock, each at an exercise price of $11.50 per share
Trading Symbol	TOIIW
Security Exchange Name	NASDAQ